root@charron:~
# mount /dev/vg0/usr-store /mnt/usr-store
mount: you must specify the filesystem type
root@charron:~
# mount -t ext4 /dev/vg0/usr-store /mnt/usr-store
mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg0-usr--store,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so